Is Beyoncé Pregnant with Baby No. 2?

Days after the New York Post, citing multiple sources, says that Beyoncé and husband Jay-Z are expecting a sibling for their daughter, now 15 months, E! Online reports that the singer is expecting.

The E! report, which comes days after Beyoncé canceled a show in Belgium due to "dehydration" and "exhaustion," also cites multiple sources.

Beyoncé, 31, has made no secret about wanting to give her first-born a sibling, and a new bump watch has commenced as the singing diva continues on a world tour that ends in Brooklyn on Aug. 5.

Meanwhile, a source told PEOPLE recently that the baby may not be on the way just yet: "Beyoncé and Jay are planning for another baby after her tour is over and things calm down just a bit."

Most recently, Beyoncé appeared in a black and gold strapless Givenchy gown – with matching boots – at the punk-themed Met Gala in New York City. Her waist was cinched tightly with a grommeted black and gold belt.